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4, 35, 243, 1875, 15150, 115776, 903439, 7005461, 54249716, 420545092, 3257486504, 25234938173, 195482980668, 1514241800363, 11729682534441, 90860069201775, 703816232110196, 5451868968128240, 42230976869002531, 327127333101076004
(列表;图表;参考;听;历史;文本;内部格式)
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